Considering that the national unemployment rate is currently 9.7% and is not expected to drop under 9% until 2012, the Democratic average will obviously rise over the coming years.

It's interesting to note that the difference in the national unemployment rate between when Bill Clinton was president and when George W. Bush was president was less than 0.1% (5.2% vs 5.27%).

Note: in months where there was a change (for instance, Democrat out, Republican in) in terms of the political party occupying the White House, I counted the month that a party took office as part of their unemployment rate history. For instance, President Obama was sworn in January of 2009, so I counted the January 2009 unemployment rate as part of the Democrat's unemployment rate history